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What is weathering steel?

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What is weathering steel?

(a) low-alloy atmospheric corrosion-resistant steel

(b) low-carbon steel

(c) high strength quenched and tempered steel

(d) fire resistant steel

I got this question during an online exam.

The query is from Types of Steel in portion Materials, Structures and Specifications of Design of Steel Structures

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Correct choice is (a) low-alloy atmospheric corrosion-resistant steel

For explanation: Weathering steel are low-alloy atmospheric corrosion-resistant steel. They are often left unpainted. They have an ultimate tensile strength of 480 MPa.

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